A reinforced cementing casing centralizer tool
By using an integrated reinforced cementing casing centralizer tool with inclined centralizing ribs and a brush design, the problems of high friction, low reset force, and incomplete mud cake removal of the casing centralizer were solved, enabling smooth casing insertion and high-quality cementing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- AKSU ZHONGMAN PETROLEUM ENG TECH CO LTD
- Filing Date
- 2025-08-01
- Publication Date
- 2026-07-10
AI Technical Summary
Existing casing centralizers suffer from problems such as high friction, low reset force, easy damage, and inability to effectively remove mud cake from the wellbore, which affect cementing quality.
The reinforced cementing casing centralizer tool adopts an integral main structure, including upper and lower sleeves and longitudinally arranged centralizing ribs. The centralizing ribs are inclined and have stress grooves. The brush contacts the well wall to remove mud cake. The flow channel design improves the restoring force and fluid flow.
This enabled the smooth insertion of the casing into the well and the effective removal of mud cake from the wellbore, improved casing centering and cementing quality, reduced the risk of centralizer damage, and enhanced cementing displacement efficiency and cement bonding quality.
Smart Images
Figure CN224478901U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a reinforced cementing casing centralizer tool. Background Technology
[0002] During drilling operations, because the wellbore has a certain inclination angle, especially in directional and horizontal wells, after the casing is inserted into the well, it tends to stick close to the bottom edge of the wellbore under the influence of gravity. During cementing, the drilling fluid at the bottom edge is not easily displaced and removed, affecting the filling effect of the cement slurry in the annulus and resulting in poor annulus cementing quality. To overcome this casing sticking phenomenon and improve the casing's centering within the wellbore, a casing centralizer needs to be installed on the casing to ensure it remains as centered as possible within the wellbore.
[0003] The problems with the casing centralizers currently in use are: the centralizer has a large starting force, resulting in high friction during casing insertion and affecting the smooth insertion of the casing; the centralizer has a small reset force, resulting in poor casing capacity after the casing is inserted and poor casing centering effect; welded and braided casing centralizers are prone to breakage and disintegration during insertion, losing their casing centralizing function; and the centralizer cannot effectively remove mud cake from the well wall, thus failing to create favorable conditions for the cementing quality of the cementing interface.
[0004] Currently, there is a patent CN215213365U that has the function of scraping mud cake off the well wall. This patent has processed a brush on the centralizing rib, but the height of the brush increases the outer diameter of the centralizing device, which increases the friction of casing insertion into the well and affects the smooth insertion of casing. Utility Model Content
[0005] The purpose of this utility model is to provide a reinforced cementing casing centralizer tool to solve and make up for the shortcomings of the current technology, so as to achieve various technical effects such as convenient on-site installation, reliable fixation, not easy to break, small starting force and large reset force, good centralizing effect, and effective scraping and breaking of mud cake on the well wall.
[0006] To achieve the above technical objectives, this utility model provides a reinforced cementing casing centralizer tool, wherein: its main structure is an integral main structure formed by cutting a spring steel seamless steel pipe and then further processing it; the integral main structure includes: an upper sleeve and a lower sleeve located at the upper and lower ends, which are accommodated and fitted onto the casing; and a plurality of centralizing ribs located in the middle and arranged longitudinally between the upper and lower sleeves. The plurality of centralizing ribs are arranged parallel to each other and spaced apart along the circumferential direction of the upper and lower sleeves, and are integrally formed and connected to the upper and lower sleeves; the centralizing ribs are inclined outward from the upper and lower ends toward the middle relative to the axis of the casing, and a stress groove is provided in the middle of each centralizing rib to increase the restoring force after deformation. A fluid flow channel is formed between two adjacent centralizing ribs; a brush is fixed on the outside of the upper and lower sleeves, and the brush abuts against the well wall to break and remove the mud cake on the well wall.
[0007] This utility model provides a reinforced cementing casing centralizer tool, which adopts an integral structure and processing mode. It simultaneously ensures casing centering and removes mud cake that damages the well wall. While ensuring that the casing can be smoothly inserted into the well, the centralizer can not only effectively improve casing centering, but is also convenient to use in the field, not easily damaged, and ensures cementing quality.
[0008] As a further improvement, the straightening rib is in the shape of an arc, and the maximum outer diameter of the arc is located in the middle of the straightening rib. The middle position is the position of the maximum outer diameter of the integral main structure, and the outer diameter at the maximum outer diameter position is consistent with the outer diameter of the drill bit forming the wellbore.
[0009] As a further improvement, the straightening ribs are symmetrically arranged outwards from the middle position, and the stress grooves are inwardly concave arc grooves.
[0010] As a further improvement, the number of straightening ribs is even, the circumferential width of the straightening ribs is 40-60mm, the thickness is the same as the thickness of the upper and lower sleeves, and the straightening ribs are processed into an arc shape after heat treatment.
[0011] As a further improvement, all of the aforementioned straightening ribs are processed to extend at an angle with the same angle direction, so that the fluid forms a swirling flow when returning upward in the flow channel between two adjacent straightening ribs.
[0012] As a further improvement, the brush has multiple brushes that are spaced apart from each other along the circumferential direction of the upper and lower sleeves and extend outwards, with the length of the brushes reaching the well wall of the well shaft.
[0013] As a further improvement, the brushes on the upper and lower sleeves are arranged in the following ways: having the same angular position and forming an overlapping layout, so that the upper and lower brushes contact the well wall at the same angular position; or having spaced angular positions and forming an intersecting layout, so that the upper and lower brushes contact the well wall at spaced angular positions.
[0014] As a further improvement, the straightening ribs are six in number and evenly arranged in a circle, and the brushes on the upper and lower sleeves are three in number and arranged as follows: the three brushes on the upper and lower sleeves are respectively arranged between the first and second, third and fourth, and fifth and sixth straightening ribs; or the three brushes on the upper sleeve are respectively arranged between the first and second, third and fourth, and fifth and sixth straightening ribs, and the three brushes on the lower sleeve are respectively arranged between the second and third, fourth and fifth, and sixth and first straightening ribs.
[0015] As a further improvement, the brush includes a brush holder and a metal wire, the metal wire being fixed on the brush holder, and the brush holder being welded to the outer circumference of the upper and lower sleeves; the brush holder is an arc-shaped flat iron sheet, the metal wire being welded and fixed to the flat iron sheet, and the thickness of the brush holder is 5-7mm.
[0016] As a further improvement, the height of the integral main structure is between 400-800mm, and its processing material is 65Mn spring steel seamless steel pipe. The height of the upper and lower sleeves is 150-180mm, the inner diameter is 1.05-1.20 times the outer diameter of the sleeve, and the outer diameter is consistent with the outer diameter of the female coupling of the sleeve.
[0017] This utility model provides a reinforced cementing casing centralizer tool that ensures smooth casing insertion into the well and centralizes the casing. Simultaneously, it effectively breaks down and removes mud cake from the wellbore, scraping and damaging the mud cake to improve the cement bonding quality at the interface and enhance cementing quality. In well sections with smaller diameters, the metal wires on the brush can effectively deform, facilitating smooth casing insertion. In well sections with larger diameters, the metal wires on the brush can spring back, further breaking down and removing mud cake from the wellbore. Attached Figure Description
[0018] Figure 1 This is a front view of the first embodiment of the present invention;
[0019] Figure 2 This is a side view of the first embodiment of the present invention;
[0020] Figure 3 This is a perspective view of the first embodiment of the present utility model;
[0021] Figure 4 This is a top view of the upper sleeve in the second embodiment of the present invention;
[0022] Figure 5 This is a top view of the lower sleeve according to the second embodiment of the present invention;
[0023] Figure 6 This is a schematic diagram showing the length direction of the brush of this utility model;
[0024] Figure 7 This is a schematic diagram of the brush holder of this utility model.
[0025] Attached reference numerals: 11 Upper sleeve; 12 Straightening rib; 13 Stress groove; 14 Lower sleeve; 15 Brush; 151 Brush holder; 152 Metal wire. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0027] like Figures 1 to 7 As shown, this utility model provides a reinforced cementing casing centralizer tool, wherein: its main structure is an integral main structure formed by cutting a spring steel seamless steel pipe and then further processing it; the integral main structure includes: an upper sleeve 11 and a lower sleeve 14 located at the upper and lower ends and fitted onto the casing, and a plurality of centralizing ribs 12 located in the middle and arranged longitudinally between the upper and lower sleeves. The plurality of centralizing ribs 12 are arranged parallel to each other and spaced apart along the circumferential direction of the upper and lower sleeves and are integrally formed and connected to the upper and lower sleeves; the centralizing ribs 12 are inclined outward from the upper and lower ends toward the middle relative to the axis of the casing, and a stress groove 13 is provided in the middle of each centralizing rib to increase the restoring force after deformation. A fluid flow channel is formed between two adjacent centralizing ribs 12; a brush 15 is fixed on the outside of the upper and lower sleeves, and the brush 15 abuts against the well wall to break and remove the mud cake on the well wall.
[0028] This utility model provides a reinforced cementing casing centralizer tool, which adopts an integral structure and processing mode. It simultaneously ensures casing centering and removes mud cake that damages the well wall. While ensuring that the casing can be smoothly inserted into the well, the centralizer can not only effectively improve casing centering, but is also convenient to use in the field, not easily damaged, and ensures cementing quality.
[0029] As a further improvement, the straightening rib 12 is in the shape of an arc, and the largest outer diameter of the arc is located in the middle of the straightening rib. The middle position is the position of the largest outer diameter of the integral main structure, and the outer diameter at the position of the largest outer diameter is consistent with the outer diameter of the drill bit forming the wellbore.
[0030] As a further improvement, the straightening ribs are symmetrically arranged outwards from the middle position, and the stress groove 13 is an inwardly concave arc groove.
[0031] As a further improvement, the plurality of straightening ribs 12 are arranged in an even number, the circumferential width of the straightening ribs 12 is 40-60mm, the thickness is the same as the thickness of the upper and lower sleeves, and the straightening ribs are processed into an arc shape after heat treatment.
[0032] As a further improvement, all of the aforementioned straightening ribs 12 are processed to extend at an angle with the same angle direction, so that the fluid forms a swirling flow when returning upward in the flow channel between two adjacent straightening ribs.
[0033] As a further improvement, the brush 15 has multiple brushes that are spaced apart from each other along the circumferential direction of the upper and lower sleeves and extend outwards on the outer circumferential surface of the upper and lower sleeves, and the length of the brushes reaches the well wall of the well shaft.
[0034] As a further improvement, the brushes 15 on the upper and lower sleeves are arranged in the following ways: having the same angular position and forming an overlapping layout, so that the upper and lower brushes contact the well wall at the same angular position; or having spaced angular positions and forming an intersecting layout, so that the upper and lower brushes contact the well wall at spaced angular positions.
[0035] As a further improvement, the straightening ribs are six in number and evenly arranged in a circle, and the brushes on the upper and lower sleeves are three in number and arranged as follows: the three brushes on the upper and lower sleeves are respectively arranged between the first and second, third and fourth, and fifth and sixth straightening ribs; or the three brushes on the upper sleeve are respectively arranged between the first and second, third and fourth, and fifth and sixth straightening ribs, and the three brushes on the lower sleeve are respectively arranged between the second and third, fourth and fifth, and sixth and first straightening ribs.
[0036] like Figure 1 , Figure 2 , Figure 3In the illustrated embodiment, there are six straightening ribs 12 evenly spaced apart, with a 60° interval between each pair of straightening ribs 12. Brushes 15 can be arranged between these intervals. In this embodiment, three brushes 15 on the upper sleeve 11 and lower sleeve 14 are arranged at the same angle, with a 120° interval between each pair of brushes 15, and they overlap vertically, forming an arrangement that targets the same area of the well wall from both the top and bottom. It can be understood that the three brushes are respectively positioned at intervals of 60°, 180°, and 300°. Figure 4 and Figure 5 In the illustrated embodiment, the upper sleeve 11 and lower sleeve 14 each have three brushes 15. Each pair of brushes 15 in each layer is arranged at a 120° angle, but they are arranged at an intersecting angle, meaning the lower brush is rotated 60° relative to the upper brush, creating an intersecting arrangement that targets different areas of the well wall. It can be understood that the three brushes of the upper sleeve 11 are arranged at intervals of 60°, 180°, and 300°, respectively, and the three brushes of the lower sleeve 14 are arranged at intervals of 0°, 120°, and 240°, thus forming a combined upper and lower arrangement at 60° angles.
[0037] As a further improvement, the brush includes a brush holder and a metal wire, the metal wire being fixed on the brush holder, and the brush holder being welded to the outer circumference of the upper and lower sleeves; the brush holder is an arc-shaped flat iron sheet, the metal wire being welded and fixed to the flat iron sheet, and the thickness of the brush holder is 5-7mm.
[0038] As a further improvement, the height of the integral main structure is between 400-800mm, and its processing material is 65Mn spring steel seamless steel pipe. The height of the upper and lower sleeves is 150-180mm, the inner diameter is 1.05-1.20 times the outer diameter of the sleeve, and the outer diameter is consistent with the outer diameter of the female coupling of the sleeve.
[0039] This utility model provides a reinforced cementing casing centralizer tool that ensures smooth casing insertion into the well and centralizes the casing. Simultaneously, it effectively breaks down and removes mud cake from the wellbore, scraping and damaging the mud cake to improve the cement bonding quality at the interface and enhance cementing quality. In well sections with smaller diameters, the metal wires on the brush can effectively deform, facilitating smooth casing insertion. In well sections with larger diameters, the metal wires on the brush can spring back, further breaking down and removing mud cake from the wellbore.
[0040] This utility model casing centralizer simultaneously achieves two functions: centralizing the casing and breaking down and removing mud cake from the well wall. It centralizes the casing with reinforcing bars and breaks down and removes mud cake from the well wall with a brush, thereby improving displacement efficiency and cement bonding quality, thus improving cementing quality, meeting the needs of oil and gas field exploration and development, extending the life of oil and gas wells, and increasing economic benefits.
[0041] Furthermore, the upper sleeve, lower sleeve, and straightening rib are made of seamless spring steel pipes, which are cut and then further processed into a single unit. The main structure is integral. This integral straightening device has a robust structure, high strength, good straightening effect, and is not easily damaged.
[0042] Furthermore, the upper and lower sleeves are the uppermost and lowermost circular sleeves of the stabilizer, which are integrally connected with the stabilizer rib. Their main function is to fit the stabilizer onto the sleeve through the upper and lower sleeves. The integral stabilizer is securely fixed onto the sleeve and is not easily damaged.
[0043] Furthermore, the stress groove of the centralizing rib is located in the middle of the centralizing rib, which is also the position where the outer diameter of the centralizer is largest. This stress groove ensures that the centralizer has good restoring force, improving its centralizing ability even after deformation when the well inclination angle is large.
[0044] Furthermore, multiple brushes are installed on both the upper and lower sleeves, with all brushes extending in a direction away from the sleeves, reaching the wellbore wall. This reduces cementing costs while breaking down and removing mud cake from the wellbore wall.
[0045] Furthermore, the brush includes a brush holder and a metal wire. The metal wire is fixed to the brush holder, and the brush is welded to the upper and lower sleeves via the brush holder. Welding and installing the brush is convenient. The brush holder is an arc-shaped flat iron sheet. After the brush is welded to the flat iron sheet, the flat iron sheet is then welded to the upper and lower sleeves. The thickness of the brush holder is 5-7mm. The brush is fixed to the upper and lower sleeves, facilitating the fixed connection of the brush to the upper and lower sleeves. While fixing the brush, it does not hinder the smooth insertion of the sleeves.
[0046] like Figures 1 to 7 As shown, the sleeve centralizer includes an upper sleeve 11, a lower sleeve 14, and a centralizing rib 12. All of these components are made of seamless steel pipe of 65Mn spring steel. The centralizing rib 12 is provided with a bent centralizing rib stress groove 13. Three brushes 15 are welded on the outer diameter surface of the upper sleeve 11 and the lower sleeve 14 of the centralizer in the 120° direction.
[0047] In this embodiment, the upper sleeve 11 and the lower sleeve 14 are fitted onto the sleeve. An integrally formed straightening rib 12 is provided between the upper sleeve 11 and the lower sleeve 14. Multiple straightening ribs 12 are provided, and all straightening ribs 12 are arranged at intervals along the circumference of the upper sleeve 11 and the lower sleeve 14 on their outer circumferential surfaces, forming a sleeve. A flow channel is formed between adjacent straightening ribs 12 to allow fluid to flow through. In other embodiments, the straightening ribs can be welded onto the upper and lower sleeves.
[0048] In this embodiment, the height of the integral elastic centralizer is between 400-800mm, and its main body is made of 65Mn spring steel seamless steel pipe. Its main structure is integral. The processed brushes 15 are evenly welded onto the outer diameter surface opposite to the upper sleeve 11 and the lower sleeve.
[0049] In this embodiment, the upper sleeve 11 and the lower sleeve 14 are the uppermost and lowermost circular sleeves of the centralizer, with a height of 150-180mm, an inner diameter that is 1.05-1.20 times the outer diameter of the sleeve used, and an outer diameter that is consistent with the outer diameter of the sleeve female coupling used.
[0050] In this embodiment, the centralizing rib 12 is made of seamless 65Mn spring steel pipe through cutting and heat treatment. It is integral with the upper and lower sleeves. Four to six centralizing ribs 12 are evenly cut along the 360° circumference of the seamless steel pipe. The circumferential width of the centralizing rib 12 is 40-60mm, and its thickness is consistent with the thickness of the upper and lower sleeves. After heat treatment, the centralizing rib 12 is processed into an arc shape. The largest outer diameter of the arc is located in the middle of the centralizing rib, and the outer diameter of the largest outer diameter is consistent with the outer diameter of the drill bit forming the wellbore. A stress groove 13 is provided at this location. The space formed between two adjacent centralizing ribs 12 serves as a fluid channel.
[0051] In this embodiment, the stress groove 13 is located in the middle of the straightening rib 12. The stress groove 13 is formed by hot working the straightening rib 12 and then bending it with a special tool. After quenching, the strength of the stress groove 13 is increased to ensure that the straightener has a good restoring force and improve the straightening ability of the straightener after deformation when the well inclination angle is large.
[0052] In this embodiment, the centralizer brush 15 includes a brush holder 151 and a metal wire 152. The metal wire 152 is fixed on the brush holder 151, and the brush is fixed on the upper sleeve 11 and the lower sleeve 14 via the brush holder 151. During welding, the welding is evenly distributed at 120° above the upper and lower ends of the flow channel. The metal wire 152 is made of 304 stainless steel or copper wire. The wire can be straight or corrugated. During the casing insertion into the well, the contact force between the wire and the well wall is used to scrape off the mud cake on the well wall, or to damage the mud cake to form grooves, which facilitate the flushing fluid to flush away the mud cake from the grooves.
[0053] This utility model discloses a reinforced casing centralizer tool, which is mainly used in cementing operations in the fields of oil and gas development, coalbed methane development, and gas storage. It can be fixed to the outside of the casing during field application and has broad prospects. Moreover, the casing centralizer of this utility model has a simple structure, is easy to operate on site, and is conducive to large-scale promotion and application.
[0054] During cementing operations, the casing centralizer is fitted onto the casing and secured with a retaining ring, allowing it to be lowered into the well along with the casing. During this process, brushes 15 on the upper sleeve 11 and lower sleeve 14 contact the well wall and generate friction. As the casing is lowered, the brushes scrape and break up the mud cake on the well wall, effectively removing and eliminating loose mud cake during casing lowering. The centralizing ribs 12 on the upper sleeve 11 and lower sleeve 14 function as the casing itself during lowering, preventing direct contact between the casing and the well wall. Once the casing is lowered to the designated position, they help to center the casing and improve its alignment. When well flushing begins, the annular fluid passes through the casing centralizer and returns upwards through the channel between the two centralizing ribs 12. After well flushing and subsequent cementing and completion operations are completed, the casing centralizer remains downhole along with the casing.
[0055] This utility model discloses a reinforced cementing casing centralizer tool that achieves two functions: wellbore mud cake destruction and removal, and casing centralization. It improves displacement efficiency and cement bonding quality, thereby improving cementing quality, extending the life of oil and gas wells, and thus increasing economic benefits.
[0056] Embodiment 2 of the reinforced cementing casing centralizer tool of this utility model: The difference between this embodiment and Embodiment 1 is that in Embodiment 1, multiple brushes 15 are fixedly connected to both the upper sleeve 11 and the lower sleeve 14, and all the brushes 15 are arranged at intervals along directions opposite to those of the upper sleeve 11 and the lower sleeve 14. In this embodiment, both the upper sleeve 11 and the lower sleeve 14 have a fixed brush, which is elongated and extends in the same direction as in Embodiment 1.
[0057] Embodiment 3 of the reinforced cementing casing centralizer tool of this utility model: The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the brush 15 includes a brush seat 151 and a metal wire 152, with the metal wire 152 fixed on the brush seat 151, and the brush 15 fixedly connected to the upper sleeve 11 and the lower sleeve 14 through the brush seat 151. In this embodiment, the brush only includes a metal wire, and the brush is directly fixed on the upper sleeve 11 and the lower sleeve 14.
[0058] Embodiment 4 of the reinforced cementing casing centralizer tool of this utility model: The difference between this embodiment and Embodiment 1 is that in Embodiment 1, each centralizer rib 12 extends along the axial direction of the casing. In this embodiment, each centralizer rib 12 can be processed to extend at an angle with the same angle direction, so that the fluid can form a swirling flow when returning upward in the flow channel between two adjacent centralizer ribs 12, further improving the cementing displacement efficiency and creating favorable conditions for improving cementing quality.
[0059] This utility model provides a reinforced cementing casing centralizer tool that simultaneously performs the functions of casing centralizer and well wall mud cake removal. It centralizes the casing and removes the well wall mud cake with a brush, thereby improving displacement efficiency and cement bonding quality, thus improving cementing quality, meeting the needs of oil and gas field exploration and development, extending the life of oil and gas wells, and increasing economic benefits.
[0060] It should be understood that the scope of protection sought by this utility model is not limited to the non-limiting embodiments, which are merely illustrative examples. The substantive scope of protection claimed in this application is further embodied in the scope provided by the independent claims and their dependent claims.
Claims
1. A reinforced cementing casing centralizer tool, characterized in that: Its main structure is an integral structure formed by cutting seamless spring steel pipes and then processing them as a whole. The integral main structure includes: an upper sleeve and a lower sleeve located at the upper and lower ends and fitted onto the sleeve, and a plurality of straightening ribs located in the middle and arranged longitudinally between the upper and lower sleeves. The plurality of straightening ribs are arranged parallel to each other and spaced apart along the circumferential direction of the upper and lower sleeves and are integrally formed and connected to the upper and lower sleeves. The straightening ribs are formed outward from the upper and lower ends toward the middle relative to the axis of the sleeve. A stress groove is provided in the middle of each straightening rib to increase the restoring force after deformation. A fluid flow channel is formed between two adjacent straightening ribs. A brush is fixedly installed on the outside of the upper and lower sleeves. The brush abuts against the well wall to break up and remove the mud cake on the well wall.
2. The reinforced cementing casing centralizer tool according to claim 1, characterized in that: The straightening rib is in the shape of an arc, and the largest outer diameter of the arc is located in the middle of the straightening rib. The middle position is the position of the largest outer diameter of the integral main structure, and the outer diameter at the position of the largest outer diameter is consistent with the outer diameter of the drill bit that forms the wellbore.
3. The reinforced cementing casing centralizer tool according to claim 2, characterized in that: The straightening ribs are symmetrically arranged outward from the middle position, and the stress grooves are inwardly concave arc grooves.
4. A reinforced cementing casing centralizer tool according to claim 3, characterized in that: The number of straightening ribs is even, the circumferential width of the straightening ribs is 40-60mm, the thickness is the same as the thickness of the upper and lower sleeves, and the straightening ribs are processed into an arc shape after heat treatment.
5. A reinforced cementing casing centralizer tool according to claim 4, characterized in that: The multiple straightening ribs are all processed to extend at an angle and have the same angle direction. When the fluid flows upward in the flow channel between two adjacent straightening ribs, it forms a swirling flow.
6. The reinforced cementing casing centralizer tool according to claim 1, characterized in that: The brush has multiple brushes arranged at intervals along the circumferential direction of the upper and lower sleeves on the outer circumferential surface of the upper and lower sleeves and extends outwards, with the length of the brush reaching the well wall of the well shaft.
7. A reinforced cementing casing centralizer tool according to claim 6, characterized in that: The brushes on the upper and lower sleeves are arranged as follows: They have the same angular position and are arranged in an overlapping layout, so that both the upper and lower brushes contact the well wall at the same angular position; or The brushes are arranged at intervals and in a staggered, intersecting pattern, so that the upper and lower brushes contact the well wall at intervals.
8. A reinforced cementing casing centralizer tool according to claim 6, characterized in that: The straightening ribs are six in number and evenly arranged in a circle. The brushes on both the upper and lower sleeves are three in number and arranged as follows: The three brushes on the upper and lower sleeves are respectively arranged between the first and second, third and fourth, and fifth and sixth straightening ribs; or The three brushes of the upper sleeve are respectively arranged between the first and second, third and fourth, and fifth and sixth straightening ribs, and the three brushes of the lower sleeve are respectively arranged between the second and third, fourth and fifth, and sixth and first straightening ribs.
9. A reinforced cementing casing centralizer tool according to claim 8, characterized in that: The brush includes a brush holder and a metal wire. The metal wire is fixed on the brush holder, and the brush holder is welded to the outer circumference of the upper and lower sleeves. The brush holder is an arc-shaped flat iron sheet, and the metal wire is welded and fixed to the flat iron sheet. The thickness of the brush holder is 5-7mm.
10. A reinforced cementing casing centralizer tool according to claim 1, characterized in that: The height of the integral main structure is between 400-800mm, and its processing material is 65Mn spring steel seamless steel pipe. The height of the upper and lower sleeves is 150-180mm, the inner diameter is 1.05-1.20 times the outer diameter of the sleeve, and the outer diameter is consistent with the outer diameter of the female coupling of the sleeve.